gistfile1.txt

The Rails Rumble's screenshot utility will access your 
official *.r13.railsrumble.com URL, but will also append 
a special `screenshot` parameter for you to detect.

Example:
http://my-app.r13.railsrumble.com/?screenshot=true

To override your entry's screenshot, detect that parameter, 
and serve an alternate HTML page.

The viewport of the capture tool is 1200px wide by 900px high. 

Feel free to make a static page with a single centered image.

Screenshots are updated once an hour and start roughly 12 hours 
into the competition.